GPRS : gateway to third generation mobile networks by Gunnar Heine

By Gunnar Heine

This leading edge new publication, from top specialists Gunnar Heine and Holger Sagkob, explains how GPRS permits enlargement of latest GSM networks to satisfy the calls for of latest cellular facts functions. It teaches you ways the packet information common GPRS will help to extend your community in the direction of 3rd new release, assembly the calls for of the most-sophisticated cellular information functions.

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25 as a method for error recognition and correction. The following problems do occur, however, when handling BEC: • BEC assumes that at least the NACK information can pass through the transmission channel without any problems. 22 The processes of BEC. case, then an endless loop will occur or the NACK information can even be misinterpreted due to bit errors. • A transmission error in the checksum field will also be interpreted as an error in the data block, which will then lead to the repeated request for a data block that is in itself error-free.

This delay is increased in DCS1800 and PCS1900 by the presence of further BCCH/SYS info. With regard to the 51 multiframe, it must be stressed that it may only be used in time slots with circuit switched control channels (SDCCH, The Basics: Principles of GSM and Influences on GPRS 21 CCCH, BCCH, SCH, FCCH), but not for circuit switched traffic channels (TCH). 1 The Introduction of the BCCH/SYS Info 13 for GPRS With the introduction of GPRS, an additional item of system information, number 13, was defined.

7 kHz above the carrier frequency. 1 and the use of the FCCH, it becomes clear that a mobile station, when selecting its cell, will first seek out a strong signal in the respective frequency band without any qualitative evaluation. 15 ms (10 TDMA frames). If this signal cannot be found, it is then clearly not a GSM carrier. If the FB is found, then it will not only positively identify a GSM carrier for the mobile station but will also help it to adjust its own frequency generator. 30). 1. The SB has a number of specific characteristics.

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